They have offered me £2k trade in on a fiesta zetec s at £10k
Ah ha. That's what this is all about. They'll spruce your car up, fix it with used parts, put an MOT on it and and stick it on the forecourt at £3.5k.
Bear in mind it's a 7 year old car with an above-average mileage, this is the time for things to start going wrong with it. Bit surprised at all the faults though, Focuses are supposed to be reliable cars.
Take it to Mike Hurst for an honest opinion. If something doesn't need doing, he'll tell you so.